How severe is CVE-2026-11604?

CVE-2026-11604 has a CVSS 4.0 base score of 5.6, rated medium severity.

Is CVE-2026-11604 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.

How do I fix CVE-2026-11604?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-11604 have an EU (EUVD) identifier?

Yes. CVE-2026-11604 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36151.

When was CVE-2026-11604 published?

CVE-2026-11604 was published on 2026-06-10 and last updated on 2026-06-17.

CVE-2026-11604

CVE-2026-11604 is a medium-severity vulnerability with a CVSS 4.0 base score of 5.6. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: Medium (CVSS 4.0 base score 5.6)
EPSS exploit prediction: 0% (4th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-36151
Weakness: CWE-122
Published: 2026-06-10
Last modified: 2026-06-17

Description

An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).

Frequently asked questions

What is CVE-2026-11604?: An incorrect buffer size calculation in the epoch key generator in OpenVPN ovpn-dco-win version 2.0.0 through 2.8.3 allows a remote authenticated peer to trigger a heap-based buffer overflow and kernel memory corruption via a crafted data packet, resulting in a system crash (denial of service).
How severe is CVE-2026-11604?: CVE-2026-11604 has a CVSS 4.0 base score of 5.6, rated medium severity.
Is CVE-2026-11604 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (4th percentile), an estimate of the probability of exploitation in the next 30 days.
How do I fix CVE-2026-11604?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-11604 have an EU (EUVD) identifier?: Yes. CVE-2026-11604 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-36151.
When was CVE-2026-11604 published?: CVE-2026-11604 was published on 2026-06-10 and last updated on 2026-06-17.

References

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